Fund raisers would not be allowed to be anything other than bake sales and such... no contributions taken from corporations, companies, individuals, etc who then feel entitled (or were promised) support on any specific item. The political party would stand up as an individual entity and work for the betterment of all people, not just democrats/republicans/whatever.
Honesty would be required. Therefore, promises would be few and far between. Instead of promising to lower taxes, they would state that their goal will be to lower taxes where possible. Basically, need to run on the idea of balancing the budget, in a timely manner, with realistic goals and expectations.
The main thing??? Government should be smaller, not larger. Should have less controls in the private homes, leaving more governing to the states and less at the National level -- more oversight at the National, while the States get to do what makes sense in their area. National government should not be involved in the individuals homes/lives... and my party would be based on that idea.
Without getting into personal issues... this is how my political party would start. Of course, no one would run or vote for them, so it would also be a short lived one.